Hi. If you are looking for state policies, Oregon has one (on the Oregon Health Authority, Addiction/Mental Health website) - as do some other states, so you'll find them if you google state trauma policy. Some local organizations in our area have also developed agency-wide policy. We have an example on our website at www.traumainformedoregon.org (look under Resources for Organizations/Providers, but there are probably other good ones I could hunt up for you as well.
Good luck.